how to resize a WEB listbox?

Hi Guys,
has anyone worked out a way to resize two listboxes which are one on top of the other separated by a line (or anything)

I.e. you click and hold the line and move the mouse up and down and the two list boxes would size themselves as you move the mouse?

Don’t know if it can be done.

Noticed this was posted in the Windows forum. You may have better luck in the Web forum.

Very few for web, but here’s one:

ended up using the scroll bar, works quite well.